Cycloid hydraulic motor，BK2-2-N-N

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Cycloid Hydraulic Motor BK2-2-N-N: Comprehensive Analysis

1. Core Characteristics of Cycloid Hydraulic Motors

• Operating Principle: Utilizes the meshing motion of the internal gear and rotor. Hydraulic oil drives the rotor to revolve around the central point, transmitting torque through a spline shaft for low-speed, high-torque operation (typically below 500 r/min, with torque exceeding hundreds of N·m).

• Structural Advantages: Compact size, lightweight design, wide speed range (as low as 15 r/min), bidirectional operation, and stepless speed control. Suitable for construction machinery, agricultural equipment, mining devices, etc.

• Key Parameters: Displacement (50–985 mL/r), operating pressure (70–200 kgf/cm², approx. 7–20 MPa), torque (5.5–185 kgf·m), overall efficiency (up to 85%).

2. Industry Applications

• Construction Machinery: Excavator travel drives, roller steering, skid-steer loader propulsion, dump truck drives.

• Agricultural Machinery: Combine harvesters, seeders, rotary tillers, feed mixers.

• Industrial Fields: Cement mixers, sweeper fans, injection molding machine pre-plasticizing, drilling rig rotation drives.

• Special Scenarios: Low-speed, high-torque requirements (e.g., chain drives, sprocket transmissions) enabling direct load driving without reduction gears.

3. Model Analysis & Speculation

• BK Series Association: "BK" in search results often relates to control appliances (e.g., BK2 series switches) or transformers. However, hydraulic motor models typically start with prefixes like "BM," "BMS," or "OMS" (e.g., BMS-80, OMS-125), suggesting potential manufacturer-specific naming systems.

• N-N Designation: In hydraulic motor models, "N" commonly denotes rated pressure levels or mounting configurations (e.g., flange, shaft distribution). Verification requires manufacturer technical documentation.

4. Potential Issues & Recommendations

• Model Accuracy: Confirm model completeness (e.g., prefixes like "BMS-" or "BKY-") and consult manufacturers for precise parameters.

• Technical Data Acquisition: Refer to typical cycloid motor ranges (displacement: 80–500 mL/r; pressure: 16–22.5 MPa; torque: 200–1100 N·m) and select models based on application requirements.

• Maintenance Considerations: Monitor backpressure (to prevent seal damage), limit radial loads, maintain oil cleanliness (≤40 μm), and adhere to maintenance schedules (e.g., initial service at 50 hours, followed by routine oil changes).

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